Swedish "coupon invalid" 1.4.8

I have problems translating the error text for the coupon. It always appears in English. Can anyone help me find it?
I´ts not working having the swedish text in "guest_step_2.php".
($_['error_coupon'] = 'Fel: Rabattkupongen är antingen ogiltig, gammal eller förbrukad!';)

Sounds like you've got the right place. Also need to change it in the payment.php file too

Thanks! Works fine now!